From b495328a30f0b4ca75335fef11d418dff383ec30 Mon Sep 17 00:00:00 2001
From: Felipe Magno de Almeida <felipe@expertise.dev>
Date: Mon, 14 Dec 2020 11:48:29 -0300
Subject: [PATCH] evil: Fix fcntl for F_SETLK and F_SETLKW wrong length
 calculation

Summary:
If length and start are both 0, size is wrongfully negative. Besides,
using length as a delimitator in a range means that [0, length) is a
half-closed interval, so we don't need to subtract by 1.

Reviewers: vtorri, woohyun, lucas, jptiz

Reviewed By: vtorri, lucas

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D12208
---
 src/lib/evil/evil_fcntl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib/evil/evil_fcntl.c b/src/lib/evil/evil_fcntl.c
index 14d10b111c..6c556a6cd7 100644
--- a/src/lib/evil/evil_fcntl.c
+++ b/src/lib/evil/evil_fcntl.c
@@ -114,7 +114,7 @@ fcntl(int fd, int cmd, ...)
              if (length != -1L)
                res = 0;
           }
-        fl->l_len = length - fl->l_start - 1;
+        fl->l_len = length - fl->l_start;
 
         pos = _lseek(fd, fl->l_start, fl->l_whence);
         if (pos != -1L)